body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1rem;
}

nav ul {
    list-style-type: none;
    padding: 0;
}

nav li {
    display: inline;
    margin-right: 20px;
}

nav a {
    color: white;
    text-decoration: none;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

section {
    margin-bottom: 2rem;
}

h2 {
    color: #0066cc;
}

ul {
    padding-left: 20px;
}

.btn {
    display: inline-block;
    background-color: #0066cc;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
}

.btn:hover {
    background-color: #004080;
}